Cognitive dissonance it what they call it.
Whatever 'it' is just shuts their brains off because 'it' is too far outside their worldview for them to experience without suffering emotional trauma.

It's why folks don't leave battle zones, they just continue on like there is no risk to them at all.
They hide in basements and pretend reality isn't happening.

1984 called it doublethinc.
I call it the product of a long, well designed engineering of consent.
Propaganda has long been effective at mass mind control.